how to fix P0301 misfire code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's high-voltage battery to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Noid light
• Safety gloves and goggles

2. Replace Spark Plug

1. Locate the spark plug for cylinder 1.
2. Use the socket set to remove the spark plug.
3. Inspect the old spark plug for wear and carbon buildup.
4. Install the new spark plug, ensuring it is tightened to the manufacturer's specified torque (typically around 15-20 lb-ft).
5. Reconnect the ignition coil.

3. Replace Ignition Coil

1. Remove the ignition coil from cylinder 1 by unscrewing the bolts holding it in place.
2. Disconnect the electrical connector from the ignition coil.
3. Install the new ignition coil by reversing the removal steps.
4. Ensure the connector is securely attached.

4. Test Fuel Injector

1. If the issue persists, check the fuel injector for cylinder 1.
2. Disconnect the fuel injector connector.
3. Use a noid light to confirm if the injector is receiving a signal.
4. If there is no signal, inspect the wiring for faults; if operational, replace the fuel injector.

5. Compression Test

1. If all components check out, perform a compression test on cylinder 1.
2. Remove the spark plug and insert the compression tester.
3. Crank the engine and record the compression reading.
4. Compare the reading with manufacturer specifications (typically around 180-200 psi). If low, further engine diagnostics are needed.